While some of Samsung's Galaxy A series smartphones have already received the Oreo update, reports are now confirming that the newest members of the series (Galaxy A8 (2018) and Galaxy A8+ (2018)) are about to join the party. Sadly, the rollout may take some time as the development work has just begun - reports suggest July-August time-frame for the final release. What's known for now is the firmware version, which is A530FXXU2BRDx. Source
Source: https://www.gsmarena.com/samsung_galaxy_a8_2018_oreo_update_is_in_works-news-30791.php